93. It can be seen from this figure that the stress increase with 

 weight for small dolosse is dramatic but that the increase becomes almost 

 linear above about 15 tons. For normal strength concrete having a tensile 

 rupture strength of approximately 600 psi, stable dolosse below 10 tons are 

 not at risk structurally, while those above 20 tons require strengthening. 



The various points plotted on this figure are prototype cases and they will be 

 discussed in the following section. 



94. Figure 12 shows a typical dolos design diagram where the hydro- 

 dynamically stable dolos weight and the structurally stable dolos weight are 

 plotted as two separate curves versus wave height. 



Wave Height in feet 



Figure 12. Dolos design diagram 



95. The strength curves are nearly horizontal, angling slightly down 

 to the right. The hydrodynamic stability curves begin at the origin and in- 

 crease at an exponential rate to the right. The design envelope would be 

 below the appropriate strength curve and to the left of the appropriate 

 hydrodynamic stability curve. This plot gives the stability for three waist 

 ratios using the results of Zwamborn, Scholtz , and Claasens (1988) as well as 



43 



